Topping the Groningen Steam Turbine Plant With a Gas Turbine

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Abstract
Retrofitting existing steam turbine power plants with a gas turbine topping cycle can greatly enhance their efficiency to levels comparable with those of plants originally constructed as fully fired combined cycles. The economic benefits of this approach make it so attractive that utilities in the Netherlands are at present converting well over 3000 MW of conventional steam power. This paper describes various technical and economic aspects of topping the natural gas-fired 600 MW Eemscentrale 2 unit. In particular, the improvements made to the thermodynamic cycle, the adaptation of its components and the partial load behavior of the plant are discussed. The economic analysis reveals that significant fuel savings justify the capital investment.

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